Question

我正在使用Flask并尝试提供文件供用户下载。

我的代码看起来像这样：

@app.route('/downloads/<string:yt_id>')
def download_file(yt_id):

    def hooks(data):
        if data['status'] == 'finished':
            filename = data['filename']

    ydl_opts = {
        'format': 'bestaudio/best',
        'postprocessors': [{
            'key': 'FFmpegExtractAudio',
            'preferredcodec': 'mp3',
            'preferredquality': '192',
        }],
        'progress_hooks': [hooks],
    }
    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
        ydl.download(['http://www.youtube.com/watch?v='+yt_id])


    return send_from_directory(".",
                               filename,
                               as_attachment=True)

我想上面代码中唯一相关的部分就是：

    return send_from_directory(".",
                               filename,
                               as_attachment=True)

这是我收到的错误消息：

NameError: global name 'send_from_directory' is not defined

我已经看过几个人们如何使用send_from_directory的例子，而且我并没有看到我正在做的事情有多大差异。所以任何帮助都将不胜感激。

Answer 1

你必须从烧瓶中导入......它应该是......

SELECT * 
FROM 
    (SELECT 
         t.[Statement_ID], t.[InvoiceID], 
         t.S_Type as Type, t.Description, t.Date, 
         t.Debit, t.Credit, b.Balance 
     FROM 
         Statement as t 
     CROSS apply 
         (SELECT Balance = SUM(Debit) - SUM(Credit) 
          FROM Statement as x 
          WHERE (x.date < t.date or x.date = t.date and x.[Statement_ID] <= t.[Statement_ID] ) 
            AND x.CustID = t.CustID ) b 
     WHERE  
          t.CustID = '48' 
          AND date between '2015-01-01' AND '2016-01-01' 
     ORDER BY
         t.date) 
ORDER BY
    InvoiceID, Statement_ID

NameError：全局名称＆＃39; send_from_directory＆＃39;没有定义

1 个答案: